#include "ext4_config.h"
#include "ext4_dir.h"
#include "ext4_dir_idx.h"
+#include "ext4_crc32c.h"
#include "ext4_inode.h"
#include "ext4_fs.h"
/****************************************************************************/
+/* Walk through a dirent block to find a checksum "dirent" at the tail */
+static struct ext4_dir_entry_tail *
+ext4_dir_get_tail(struct ext4_inode_ref *inode_ref,
+ struct ext4_dir_entry_ll *de)
+{
+ struct ext4_dir_entry_tail *t;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ t = EXT4_DIRENT_TAIL(de, ext4_sb_get_block_size(sb));
+
+ if (t->reserved_zero1 ||
+ to_le16(t->rec_len) != sizeof(struct ext4_dir_entry_tail) ||
+ t->reserved_zero2 ||
+ t->reserved_ft != EXT4_DIRENTRY_DIR_CSUM)
+ return NULL;
+
+ return t;
+}
+
+#if CONFIG_META_CSUM_ENABLE
+static uint32_t ext4_dir_checksum(struct ext4_inode_ref *inode_ref,
+ struct ext4_dir_entry_ll *dirent, int size)
+{
+ uint32_t checksum;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+ uint32_t ino_index = to_le32(inode_ref->index);
+ uint32_t ino_gen =
+ to_le32(ext4_inode_get_generation(inode_ref->inode));
+
+ /* First calculate crc32 checksum against fs uuid */
+ checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid, sizeof(sb->uuid));
+ /* Then calculate crc32 checksum against inode number
+ * and inode generation */
+ checksum = ext4_crc32c(checksum, &ino_index,
+ sizeof(ino_index));
+ checksum = ext4_crc32c(checksum, &ino_gen,
+ sizeof(ino_gen));
+ /* Finally calculate crc32 checksum against directory entries */
+ checksum = ext4_crc32c(checksum, dirent, size);
+ return checksum;
+}
+#else
+#define ext4_dir_checksum(...) 0
+#endif
+
+bool
+ext4_dir_checksum_verify(struct ext4_inode_ref *inode_ref,
+ struct ext4_dir_entry_ll *dirent)
+{
+#ifdef CONFIG_META_CSUM_ENABLE
+ struct ext4_dir_entry_tail *t;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ /* Compute the checksum only if the filesystem supports it */
+ if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ t = ext4_dir_get_tail(inode_ref, dirent);
+ if (!t) {
+ /* There is no space to hold the checksum */
+ return false;
+ }
+
+ if (t->checksum != to_le32(ext4_dir_checksum(inode_ref, dirent,
+ (char *)t - (char *)dirent)))
+ return false;
+
+ }
+#endif
+ return true;
+}
+
+/* checksumming functions */
+void initialize_dir_tail(struct ext4_dir_entry_tail *t)
+{
+ memset(t, 0, sizeof(struct ext4_dir_entry_tail));
+ t->rec_len = to_le16(sizeof(struct ext4_dir_entry_tail));
+ t->reserved_ft = EXT4_DIRENTRY_DIR_CSUM;
+}
+
+void ext4_dir_set_checksum(struct ext4_inode_ref *inode_ref,
+ struct ext4_dir_entry_ll *dirent)
+{
+ struct ext4_dir_entry_tail *t;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ /* Compute the checksum only if the filesystem supports it */
+ if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ t = ext4_dir_get_tail(inode_ref, dirent);
+ if (!t) {
+ /* There is no space to hold the checksum */
+ return;
+ }
+
+ t->checksum = to_le32(ext4_dir_checksum(inode_ref, dirent,
+ (char *)t - (char *)dirent));
+ }
+}
+
/**@brief Do some checks before returning iterator.
* @param it Iterator to be checked
* @param block_size Size of data block
* @return Error code
*/
-static int ext4_dir_iterator_set(struct ext4_directory_iterator *it,
+static int ext4_dir_iterator_set(struct ext4_dir_iterator *it,
uint32_t block_size)
{
it->current = NULL;
if (offset_in_block > block_size - 8)
return EIO;
- struct ext4_directory_entry_ll *entry =
+ struct ext4_dir_entry_ll *entry =
(void *)(it->current_block.data + offset_in_block);
/* Ensure that the whole entry does not overflow the block */
* @param pos Position of the next entry
* @return Error code
*/
-static int ext4_dir_iterator_seek(struct ext4_directory_iterator *it,
+static int ext4_dir_iterator_seek(struct ext4_dir_iterator *it,
uint64_t pos)
{
uint64_t size =
/* Compute next block address */
uint32_t block_size = ext4_sb_get_block_size(&it->inode_ref->fs->sb);
uint64_t current_block_idx = it->current_offset / block_size;
- uint64_t next_block_idx = pos / block_size;
+ uint32_t next_block_idx = pos / block_size;
/*
* If we don't have a block or are moving across block boundary,
return rc;
}
- uint32_t next_block_phys_idx;
+ ext4_fsblk_t next_block_phys_idx;
int rc = ext4_fs_get_inode_data_block_index(
- it->inode_ref, next_block_idx, &next_block_phys_idx);
+ it->inode_ref, next_block_idx,
+ &next_block_phys_idx,
+ false);
if (rc != EOK)
return rc;
return ext4_dir_iterator_set(it, block_size);
}
-int ext4_dir_iterator_init(struct ext4_directory_iterator *it,
+int ext4_dir_iterator_init(struct ext4_dir_iterator *it,
struct ext4_inode_ref *inode_ref, uint64_t pos)
{
it->inode_ref = inode_ref;
return ext4_dir_iterator_seek(it, pos);
}
-int ext4_dir_iterator_next(struct ext4_directory_iterator *it)
+int ext4_dir_iterator_next(struct ext4_dir_iterator *it)
{
int r = EOK;
uint16_t skip;
return r;
}
-int ext4_dir_iterator_fini(struct ext4_directory_iterator *it)
+int ext4_dir_iterator_fini(struct ext4_dir_iterator *it)
{
it->current = 0;
}
void ext4_dir_write_entry(struct ext4_sblock *sb,
- struct ext4_directory_entry_ll *entry,
+ struct ext4_dir_entry_ll *entry,
uint16_t entry_len, struct ext4_inode_ref *child,
const char *name, size_t name_len)
{
/* Set type of entry */
switch (ext4_inode_type(sb, child->inode)) {
case EXT4_INODE_MODE_DIRECTORY:
- ext4_dir_entry_ll_set_inode_type(sb, entry,
- EXT4_DIRECTORY_FILETYPE_DIR);
+ ext4_dir_entry_ll_set_inode_type(sb, entry, EXT4_DIRENTRY_DIR);
break;
case EXT4_INODE_MODE_FILE:
- ext4_dir_entry_ll_set_inode_type(
- sb, entry, EXT4_DIRECTORY_FILETYPE_REG_FILE);
+ ext4_dir_entry_ll_set_inode_type(sb, entry,
+ EXT4_DIRENTRY_REG_FILE);
break;
case EXT4_INODE_MODE_SOFTLINK:
- ext4_dir_entry_ll_set_inode_type(
- sb, entry, EXT4_DIRECTORY_FILETYPE_SYMLINK);
+ ext4_dir_entry_ll_set_inode_type(sb, entry,
+ EXT4_DIRENTRY_SYMLINK);
break;
default:
/* FIXME: right now we only support 3 inode type. */
#if CONFIG_DIR_INDEX_ENABLE
/* Index adding (if allowed) */
- if ((ext4_sb_has_feature_compatible(&fs->sb,
- EXT4_FEATURE_COMPAT_DIR_INDEX)) &&
+ if ((ext4_sb_feature_com(&fs->sb, EXT4_FCOM_DIR_INDEX)) &&
(ext4_inode_has_flag(parent->inode, EXT4_INODE_FLAG_INDEX))) {
int rc = ext4_dir_dx_add_entry(parent, child, name);
/* Linear algorithm */
uint32_t iblock = 0;
- uint32_t fblock = 0;
+ ext4_fsblk_t fblock = 0;
uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
uint32_t inode_size = ext4_inode_get_size(&fs->sb, parent->inode);
uint32_t total_blocks = inode_size / block_size;
bool success = false;
for (iblock = 0; iblock < total_blocks; ++iblock) {
int rc =
- ext4_fs_get_inode_data_block_index(parent, iblock, &fblock);
+ ext4_fs_get_inode_data_block_index(parent,
+ iblock, &fblock,
+ false);
if (rc != EOK)
return rc;
if (rc != EOK)
return rc;
+ if (!ext4_dir_checksum_verify(
+ parent,
+ (struct ext4_dir_entry_ll *)
+ block.data)) {
+ ext4_dbg(DEBUG_DIR,
+ DBG_WARN "Leaf block checksum failed."
+ "Inode: %" PRIu32", "
+ "Block: %" PRIu32"\n",
+ parent->index,
+ iblock);
+ }
+
/* If adding is successful, function can finish */
- rc = ext4_dir_try_insert_entry(&fs->sb, &block, child, name,
+ rc = ext4_dir_try_insert_entry(&fs->sb, parent, &block, child, name,
name_len);
if (rc == EOK)
success = true;
/* Load new block */
struct ext4_block new_block;
- rc = ext4_block_get(fs->bdev, &new_block, fblock);
+ rc = ext4_block_get_noread(fs->bdev, &new_block, fblock);
if (rc != EOK)
return rc;
/* Fill block with zeroes */
memset(new_block.data, 0, block_size);
- struct ext4_directory_entry_ll *block_entry = (void *)new_block.data;
- ext4_dir_write_entry(&fs->sb, block_entry, block_size, child, name,
- name_len);
+ struct ext4_dir_entry_ll *block_entry = (void *)new_block.data;
/* Save new block */
+ if (ext4_sb_feature_ro_com(&fs->sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ ext4_dir_write_entry(&fs->sb, block_entry,
+ block_size - sizeof(struct ext4_dir_entry_tail),
+ child,
+ name, name_len);
+ initialize_dir_tail(EXT4_DIRENT_TAIL(new_block.data,
+ ext4_sb_get_block_size(&fs->sb)));
+ } else
+ ext4_dir_write_entry(&fs->sb, block_entry, block_size, child, name,
+ name_len);
+
+ ext4_dir_set_checksum(parent,
+ (struct ext4_dir_entry_ll *)new_block.data);
new_block.dirty = true;
rc = ext4_block_set(fs->bdev, &new_block);
return rc;
}
-int ext4_dir_find_entry(struct ext4_directory_search_result *result,
+int ext4_dir_find_entry(struct ext4_dir_search_result *result,
struct ext4_inode_ref *parent, const char *name,
uint32_t name_len)
{
struct ext4_sblock *sb = &parent->fs->sb;
+ /* Entry clear */
+ result->block.lb_id = 0;
+ result->dentry = NULL;
+
#if CONFIG_DIR_INDEX_ENABLE
/* Index search */
- if ((ext4_sb_has_feature_compatible(sb,
- EXT4_FEATURE_COMPAT_DIR_INDEX)) &&
+ if ((ext4_sb_feature_com(sb, EXT4_FCOM_DIR_INDEX)) &&
(ext4_inode_has_flag(parent->inode, EXT4_INODE_FLAG_INDEX))) {
int rc = ext4_dir_dx_find_entry(result, parent, name_len, name);
/* Linear algorithm */
uint32_t iblock;
- uint32_t fblock;
+ ext4_fsblk_t fblock;
uint32_t block_size = ext4_sb_get_block_size(sb);
uint32_t inode_size = ext4_inode_get_size(sb, parent->inode);
uint32_t total_blocks = inode_size / block_size;
for (iblock = 0; iblock < total_blocks; ++iblock) {
/* Load block address */
int rc =
- ext4_fs_get_inode_data_block_index(parent, iblock, &fblock);
+ ext4_fs_get_inode_data_block_index(parent,
+ iblock, &fblock,
+ false);
if (rc != EOK)
return rc;
if (rc != EOK)
return rc;
+ if (!ext4_dir_checksum_verify(
+ parent,
+ (struct ext4_dir_entry_ll *)
+ block.data)) {
+ ext4_dbg(DEBUG_DIR,
+ DBG_WARN "Leaf block checksum failed."
+ "Inode: %" PRIu32", "
+ "Block: %" PRIu32"\n",
+ parent->index,
+ iblock);
+ }
+
/* Try to find entry in block */
- struct ext4_directory_entry_ll *res_entry;
+ struct ext4_dir_entry_ll *res_entry;
rc = ext4_dir_find_in_block(&block, sb, name_len, name,
&res_entry);
if (rc == EOK) {
return rc;
}
- /* Entry was not found */
-
- result->block.lb_id = 0;
- result->dentry = NULL;
-
return ENOENT;
}
return ENOTDIR;
/* Try to find entry */
- struct ext4_directory_search_result result;
+ struct ext4_dir_search_result result;
int rc = ext4_dir_find_entry(&result, parent, name, name_len);
if (rc != EOK)
return rc;
uint32_t offset = 0;
/* Start from the first entry in block */
- struct ext4_directory_entry_ll *tmp_dentry =
+ struct ext4_dir_entry_ll *tmp_dentry =
(void *)result.block.data;
uint16_t tmp_dentry_length =
ext4_dir_entry_ll_get_entry_length(tmp_dentry);
tmp_dentry, tmp_dentry_length + del_entry_length);
}
+ ext4_dir_set_checksum(parent,
+ (struct ext4_dir_entry_ll *)result.block.data);
result.block.dirty = true;
return ext4_dir_destroy_result(parent, &result);
}
int ext4_dir_try_insert_entry(struct ext4_sblock *sb,
+ struct ext4_inode_ref *inode_ref,
struct ext4_block *target_block,
struct ext4_inode_ref *child, const char *name,
uint32_t name_len)
/* Compute required length entry and align it to 4 bytes */
uint32_t block_size = ext4_sb_get_block_size(sb);
uint16_t required_len =
- sizeof(struct ext4_fake_directory_entry) + name_len;
+ sizeof(struct ext4_fake_dir_entry) + name_len;
if ((required_len % 4) != 0)
required_len += 4 - (required_len % 4);
/* Initialize pointers, stop means to upper bound */
- struct ext4_directory_entry_ll *dentry = (void *)target_block->data;
- struct ext4_directory_entry_ll *stop =
+ struct ext4_dir_entry_ll *dentry = (void *)target_block->data;
+ struct ext4_dir_entry_ll *stop =
(void *)(target_block->data + block_size);
/*
while (dentry < stop) {
uint32_t inode = ext4_dir_entry_ll_get_inode(dentry);
uint16_t rec_len = ext4_dir_entry_ll_get_entry_length(dentry);
+ uint8_t inode_type = ext4_dir_entry_ll_get_inode_type(sb, dentry);
/* If invalid and large enough entry, use it */
- if ((inode == 0) && (rec_len >= required_len)) {
+ if ((inode == 0) &&
+ (inode_type != EXT4_DIRENTRY_DIR_CSUM) &&
+ (rec_len >= required_len)) {
ext4_dir_write_entry(sb, dentry, rec_len, child, name,
name_len);
+ ext4_dir_set_checksum(inode_ref,
+ (struct ext4_dir_entry_ll *)
+ target_block->data);
target_block->dirty = true;
return EOK;
ext4_dir_entry_ll_get_name_length(sb, dentry);
uint16_t used_space =
- sizeof(struct ext4_fake_directory_entry) +
+ sizeof(struct ext4_fake_dir_entry) +
used_name_len;
if ((used_name_len % 4) != 0)
/* Cut tail of current entry */
ext4_dir_entry_ll_set_entry_length(dentry,
used_space);
- struct ext4_directory_entry_ll *new_entry =
+ struct ext4_dir_entry_ll *new_entry =
(void *)((uint8_t *)dentry + used_space);
ext4_dir_write_entry(sb, new_entry, free_space,
child, name, name_len);
+ ext4_dir_set_checksum(inode_ref,
+ (struct ext4_dir_entry_ll *)
+ target_block->data);
target_block->dirty = true;
return EOK;
}
int ext4_dir_find_in_block(struct ext4_block *block, struct ext4_sblock *sb,
size_t name_len, const char *name,
- struct ext4_directory_entry_ll **res_entry)
+ struct ext4_dir_entry_ll **res_entry)
{
/* Start from the first entry in block */
- struct ext4_directory_entry_ll *dentry =
- (struct ext4_directory_entry_ll *)block->data;
+ struct ext4_dir_entry_ll *dentry =
+ (struct ext4_dir_entry_ll *)block->data;
/* Set upper bound for cycling */
uint8_t *addr_limit = block->data + ext4_sb_get_block_size(sb);
return EINVAL;
/* Jump to next entry */
- dentry = (struct ext4_directory_entry_ll *)((uint8_t *)dentry +
+ dentry = (struct ext4_dir_entry_ll *)((uint8_t *)dentry +
dentry_len);
}
}
int ext4_dir_destroy_result(struct ext4_inode_ref *parent,
- struct ext4_directory_search_result *result)
+ struct ext4_dir_search_result *result)
{
if (result->block.lb_id)
return ext4_block_set(parent->fs->bdev, &result->block);
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